PSCC was updated through CC and on first try at using I get this error:

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PhotoshopCC64.exe - Entry Point Not Found

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The procedure entry point ??1?$TwoPassSynthesisInterface@U?$pixel@EU?$layout@U?$vector1@Ugray_color_t@gil@boost@@@m pl@boost@@U?$range_c@H$0A@$00@23@@gil@boost@@@gil@boost@@@PM@@QEAA@XZ could not be located in the dynamic link library PatchMatch.dll.

I found the problem. I still have PSCS6 on my PC and the OpenWith was not reset to PSCC. I don't understand how the update could cause this but it does. Initial reinstall of PSCC built OpenWith correctly and works fine.